Magnetic disc with carbon protective layer having regions differing in hardness
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Aug 8, 1996
filing date -
Feb 5, 1996
priority date (Note) -
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Abstract
A magnetic disc for use in a disc drive data storage system is disclosed. The magnetic disc includes a layer of magnetic material deposited on a substrate and a carbon overcoat layer deposited on the layer of magnetic material. The carbon overcoat layer has a first hardness over a contact start-stop region of the disc. The carbon overcoat layer has a second hardness over a data storage region of the disc. The second hardness is softer than the first hardness and than a hardness of a diamond like coating on an associated magnetic head so that disc asperities in the data storage region of the carbon overcoat layer will wear upon impact with the magnetic head.
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